Actress Liz Hurley has tweeted a graphic picture of a knife wound suffered by her nephew as she appealed for help to find five men who tried to kidnap him in a road rage attack.

Miles Hurley lost four pints of blood when he and another friend were stabbed following a minor road smash in Wandsworth, south-west London on March 8.

On Tuesday his aunt revealed that the men who attacked her nephew had also tried to stuff him into the boot of their car.

Mr Hurley and his friend, both 21, were driving along Wandsworth Road in a beige Fiat 500 when they were involved in a minor crash with a black hatchback.

A row broke out and led to a high speed chase, which ended in Ascalon Street when both groups got out of the cars and the model and his friend were attacked.

Under the heading "Let's find these vicious knifemen and make our streets safer" Hurley said on Twitter: "The victims drove to Ascalon Road, and got out of their car.

"The suspects also stopped, got out of their vehicle, attempted and failed to abduct my nephew by putting him in the trunk of their car, stabbed them both and drove off."

She also posted a photo of the stab wound in his back.

Writing on Instagram at the weekend she pledged to help make the capital's streets safer: "We need to make our streets safer and I want to be part of the movement to achieve that. I hope you will join me."

She added: "Thank you to all who sent such kind messages following the news that my nephew was viciously stabbed last week. His wound is shocking, he remains in great pain and he can hardly move, but he is slowly recovering."

She had previously used Twitter to speak of her pride at her nephew.

Earlier Scotland Yard released a CCTV clip of the black hatchback, which had blacked out windows, that they are trying to trace.

Detectives are appealing for anyone who saw either the beige Fiat 500 or black hatchback on Wandsworth Road and in the Patmore Estate at about 8.45pm on March 8 to contact them.

The driver of the suspects' car was white or mixed race, aged in his early to mid-20s, 6ft, well-built and with a shaved head and stubble. He was wearing a navy blue tracksuit. His passengers were all young black men, police said.

Detective Constable Simon Monga said: "This was a violent and unnecessary attack. A minor traffic collision has resulted in two men being stabbed. It is only by sheer luck that their injuries are not more serious.

"If you have any information about the stabbing and the identity of the suspects, please call police without delay. It is vitally important that we trace these people."